Anithistamines!!??

Took an Antihistamine this morning. Following bouts of random eye watering over the last couple of days. Surely my hay fever can't be starting already!? Although it does seem to start earlier and earlier in the past few years.


I take 10mg of ceterizine, in the morning. At the moment I'm taking the Di-hydrochloride form, which seems to make me more tired than the hydrochloride form.

Any medical or chemistry experts care to explain that one??